What does the endocrine system primarily control?

The endocrine system primarily controls hormonal secretion, which involves the production and release of hormones into the bloodstream. These hormones act as chemical messengers that regulate various bodily functions, including growth, metabolism, reproduction, and mood. Hormonal secretions have far-reaching effects on the body, influencing processes such as homeostasis, stress responses, and overall physiological balance.

In contrast, the roles suggested by the other options—movement coordination, nutrient absorption, and bacterial infection—are primarily managed by different systems. For example, movement coordination is mainly governed by the nervous system, while nutrient absorption is predominantly a function of the digestive system. Bacterial infection response involves the immune system. Thus, the primary role of the endocrine system in regulating hormonal secretion distinguishes it as the correct choice.